Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d81d0b0e007e2e8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 04:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: feb3bcb14dd484b84e63ee34d790ecf8 SHA-1: e6abdda6cf4e12ab95b5910d7a25a1c67308aef9 SHA-256: 7d81d0b0e007e2e8c9c331293e7498323d888d14fed684af36943a4b50ef747b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains a link farm pointing to various PDF files hosted on compromised websites, likely intended to trick users into downloading malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://aksaaydinlatma.com/img/editor/image/file/13407221254.pdf In PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607318e354b29---sokezobovufufidu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fcfb4d59e---kinekuta.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091a1e58d4cc---63475981805.pdfIn PDF document text
    • http://bethelcommunityone.com/clients/880032/File/gadofenajexobivuwol.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/19227236937.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/86350931429.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/wudofejifutisuwa.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/89608916240.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/92197891534.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/sejolubuma.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/8116051977.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wimemamisagigulugoberu.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/riliparojesafina.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/b9lsh157jr1k49mm9rjftibnm5/50505651610.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5344649234ad1ee75e1077edd04c4f53/zowarumopu.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/8355957912.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16099833592b04---defatemolasotawojomuvote.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/94877245101.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/bogot.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b0c89b26ee550772d1d1b3dc87c809c7/66891429696.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/tazamem.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a5d255c72---tiguviwanapoxitawopiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=tenses+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 10248 bytes
SHA-256: 35a41f382bd1ee830aa75ba528d19b7a438163e68336a84434724dbf2dcc4a2d
font_01_sfnt_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 17760 bytes
SHA-256: c4a6c16288faeff9e340dc2b88a07b1348a8251d90a0eb519b4c06f4eeebbfcb
font_02_sfnt_off00011f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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